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In terms of educational concept, teachers also need to adapt to this change from large class teaching to small class teaching. Teacher training is particularly important. Schools can organize teachers to participate in training courses in small class teaching and learn the methods and skills of small class teaching, such as how to carry out personalized teaching and how to organize efficient group activities, so as to improve teachers' teaching ability to adapt to the new teaching mode.1. Challenges and countermeasures of educational resources1. Challenges and countermeasures of educational resources

1. European and American cases1. European and American casesI. Successful experiences of Europe, America, Japan and South Korea

1. European and American cases2. The change of social concept and educational concept1. European and American cases